What happens when we "cheat" with our heads and hearts, instead of our bodies? Is there really such a thing as emotional infidelity? Where is the line between friendship and something more, and how do you know if you've crossed it? Do you owe a partner "all of you"—mind, body and soul? Is it possible to love more than one person and still be faithful?

Today, Nina explores this foggy terrain, where boundaries may not be as clear-cut as one would imagine.

Got something you want to ask Nina? (Of course you do.) Drop her a line at tuesdayswithnina@gmail.com. Now, while can’t promise that every question received will get a personal response, however, those that do will be answered frankly, entertainingly, enlighteningly and, if we know Nina, in the spirit of happy, healthy sex and a satisfied libido.